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Ur was a supercontinent that formed (3 billion) in the early 3,000 million years ago Archean eon; perhaps the oldest continent on Earth, half a billion years older than [1 ] Arctica, but it may have been preceded by one other supercontinent, Vaalbara, which is suggested to have formed about . 3,600 to 3,100 million years ago Ur joined with the continents [2 ] Nena and Atlantica about (1 billion) to form the supercontinent 1,000 million years ago Rodinia. Ur survived as a single unit until it was sundered when the supercontinent Pangaea broke apart into Laurasia and Gondwana. [3 ]
Formation and breakup [ edit ]
This article appears to contradict another article.
Rocks that made up Ur are now parts of
Africa, Australia, and India. [3 ]
In the early period of Ur's existence, it was probably the only continent on Earth, and as such is considered a
supercontinent, though it was probably smaller than present day Australia. When Ur was the only continent on Earth, all other land was in the form of small granite islands and small land-masses like Kenorland that were not large enough to be continents.
Timeline [ edit ]
~3 billion years ago, Ur formed as the only
continent on Earth. ~2.8 billion years ago, Ur was a part of the major supercontinent
Kenorland. ~2 billion years ago, Ur was a part of the major supercontinent
Columbia. ~1 billion years ago, Ur was a part of the major supercontinent
Rodinia. ~550 million years ago, Ur was a part of the major supercontinent
Pannotia. ~300 million years ago, Ur was a part of the major supercontinent
Pangaea. ~208 million years ago, Ur was torn apart into parts of
Laurasia and Gondwana. ~65 million years ago, the
African part of Ur was torn apart as part of India. ~Present, Ur is part of Australia and Madagascar.
References [ edit ]
External links [ edit ]